Custoias in Summer
In summer (June, July and August), Custoias sees average daytime highs around 28°C and overnight lows near 14°C, with 45 mm of rain over about 11 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 24°C in early June to 28°C by late August. The sky is clear or mostly clear about 65% of the time across summer, and the air most often feels dry.
Summer is Custoias's best season of the year to visit on our travel score. For the whole year in context, see Custoias's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 14°C
- Rainfall
- 45 mm
- 11 wet days
- Avg wind
- 8 km/h
- Travel score
- 7.3
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Custoias in Summer
Over the season highs climb from about 24°C in early June to 28°C by late August.
A typical summer day in Custoias reaches about 28°C and drops to 14°C overnight. The warmest of the three months is July, the coolest June.
Custoias weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 10° / 3° | 62 | 8.7 | 9.4 | 2.3 |
| Feb | 12° / 3° | 43 | 6.6 | 10.4 | 3.5 |
| Mar | 15° / 5° | 49 | 7.9 | 11.7 | 4.9 |
| Apr | 17° / 7° | 54 | 9.8 | 13.1 | 5.6 |
| May | 21° / 10° | 49 | 9.2 | 14.3 | 6.7 |
| Jun | 26° / 13° | 20 | 4.8 | 14.9 | 7.8 |
| Jul | 29° / 15° | 12 | 2.6 | 14.7 | 7.1 |
| Aug | 29° / 15° | 13 | 3.4 | 13.6 | 7.1 |
| Sep | 25° / 13° | 34 | 4.6 | 12.3 | 7.9 |
| Oct | 19° / 10° | 83 | 9.3 | 10.9 | 6.3 |
| Nov | 13° / 6° | 69 | 9.2 | 9.7 | 3.9 |
| Dec | 10° / 4° | 68 | 8.3 | 9.1 | 2.5 |
Cloud cover in Summer
The sky is clear or mostly clear about 65% of the time across summer.
Chance of precipitation in Summer
Custoias gets around 45 mm of rain over 11 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 8 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 42 min in early June to 13 hours by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 7.1 kWh/m².
Is summer a good time to visit Custoias?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is one of the better times to visit Custoias for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Custoias in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Custoias sees daytime highs around 28°C and nights near 14°C. Pack light clothes and sun protection. About 11 days see rain.
UV index in Custoias in Summer
Clear-sky midday UV across summer averages around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Custoias peaks around July 12 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 5 | 6 | 7 | 9 | 9 | 9 | 6 | 5 | 2 | 2 |
| Level | Low | Moderate | High | High | High | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 5 | High |
| Apr | 6 | High |
| May | 7 | High |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 9 | Very high |
| Sep | 6 | High |
| Oct | 5 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Custoias in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Custoias is worst in August — around 22 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (November, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 10 | 10 | 13 | 11 | 8 | 9 | 12 | 22 | 18 | 13 | 7 | 7 |
| Level | Good | Good | Moderate | Good | Good | Good | Good | Moderate | Moderate | Moderate | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 10 | Good |
| Feb | 10 | Good |
| Mar | 13 | Moderate |
| Apr | 11 | Good |
| May | 8 | Good |
| Jun | 9 | Good |
| Jul | 12 | Good |
| Aug | 22 | Moderate |
| Sep | 18 | Moderate |
| Oct | 13 | Moderate |
| Nov | 7 | Good |
| Dec | 7 | Good |
Where is Custoias?
Custoias sits at 41.1°N, 7.3°W, 569 m above sea level, in Portugal. The nearest listed city is Vila Nova de Foz Côa, 15 km away.
Topography around Custoias
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Custoias.
Within 3 km, the terrain around Custoias has large variations in elevation — a maximum elevation change of 671 m around an average of 479 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 921 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,573 m.
The land around Custoias is covered by shrubs (40%), grassland (30%) and trees (29%) within 3 km, grassland (44%), trees (26%) and shrubs (23%) within 16 km, and grassland (58%) and trees (30%) within 80 km.
Portugal travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E / F
- 230 V · 50 Hz
- Prices
- ≈ 60% of US
- price level, 2025
- GDP per capita
- $32,082
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 95%
- of population, 2024
- Homicide rate
- 0.7
- per 100k, 2022
- Road deaths
- 8.2
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Very high
- EF EPI 612
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Custoias (41.1053°, -7.321°, elevation 569 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.